JGB Yields Rise, Japan’s Ultra-Low Interest Rate Era May End Faster, What Is the Logic Behind It?

TradingKey - Recently, the Japanese government bond market has been undergoing a rare and intense repricing. As the 5-year JGB yield hits record highs and the 10-year yield approaches multi-decade peaks, market expectations that Japan's era of ultra-low interest rates is rapidly coming to an end have surged.

On March 27, the Japanese government bond market once again became the focus of global attention. The 5-year JGB yield rose to 1.83%, hitting a record high, while the 10-year yield further climbed to 2.383%, nearing long-term highs.

On the surface, this is just another uptick in bond yields. However, what is truly concerning is that the market has begun to interpret this as a deeper shift: the Bank of Japan's policy path, the inflation outlook, and energy shocks are collectively pushing the JGB market into a more strained range.

What is the underlying nature of this surge in government bond yields?

While it appears to be a case of rising bond yields and falling bond prices, the deeper implication is that the market is simultaneously trading three variables: whether the Bank of Japan will hike rates faster, whether oil shocks will push inflation even higher, and whether Japan's fiscal and supply-side measures can stabilize the market.

Recently, the Bank of Japan updated its estimates for Japan’s natural rate of interest, placing the range roughly between -0.9% and +0.5%, and noting that many model parameters have been rising modestly. Meanwhile, the current short-term policy rate remains at just 0.75%. This suggests that even as Japan bids farewell to the era of ultra-low rates, there may still be room for further policy adjustments.

In other words, the bond market is not selling "bonds themselves" but is instead pricing in higher future policy rates, higher inflation, and higher financing costs. As long as the market believes the BOJ will continue to tighten, the yield curve will keep shifting upward.

What are the reasons behind the rise in government bond yields?

The continued rise in bond yields this time is highly correlated with the situation in the Middle East.

Reuters noted that after the U.S. and Israel launched strikes against Iran, rising oil prices and increased shipping risks in the Strait of Hormuz have forced the BOJ’s seemingly clear path toward near-term rate hikes to become blurred.

A former senior BOJ official even believes the central bank will explicitly highlight two types of risks in its next quarterly report: conflict weighing on demand on one side, and supply shocks driving up inflation on the other.

It is worth noting that Japan is highly dependent on energy imports. Rising oil prices do not just represent simple cost-push inflation; they simultaneously hit corporate profits, household consumption, and real wage expectations.

Although the BOJ kept interest rates unchanged at its March meeting, it clearly warned that rising energy costs could continue to drive up underlying inflation. Some members even advocated again for raising the rate to 1.0%. This indicates that hawkish pressure exists within the central bank, but it is waiting for clearer data.

What is the bond market anticipating?

Current market pricing is shifting toward the view that "the Bank of Japan cannot wait too long to hike rates."

Former BOJ Chief Economist Kameda stated publicly that as crude oil costs rise, the central bank might hike rates by June at the latest to avoid being "too slow" in curbing inflation. Reuters also reported that the market has begun to put the possibility of an "April rate hike" back on the table.

This is also why 5-year and 10-year yields are rising faster than many expected. Short-end yields track policy expectations more closely, suggesting that the market is no longer satisfied with the old narrative of "the BOJ's slow normalization of interest rate policy" and has instead begun trading a "faster, more continuous hiking path." Once the yield curve moves this way, the pressure on the bond market is no longer a series of isolated shocks, but rather the entire curve being lifted.

What does government intervention by Japan signify?

If yields were only rising slightly, fiscal authorities typically wouldn't react strongly. However, the Japanese government has already begun to respond from both the subsidy and supply management fronts.

Reuters reported that Tokyo is deploying 800 billion yen in reserve funds to lower gasoline prices and is considering intervening in crude oil futures markets. Meanwhile, the Ministry of Finance is assessing a reduction in buybacks of inflation-linked bonds to adapt to rising inflation expectations.

South Korea is also taking concurrent measures, including bond buybacks and subsidies, indicating that the issue is not limited to Japan; the entire Asian region is facing the combined pressure of "energy shocks and interest rate repricing."

Actions on the fiscal side are crucial because they signal that the market has begun to worry: if JGB yields continue to rise, the problem will not just be higher financing costs, but also a squeeze on debt refinancing, budget balances, and policy maneuverability.

Japan already has a high debt load, and with every step up in yields, future interest expense pressure intensifies. Reuters previously noted that the Japanese Ministry of Finance expects debt issuance to rise further in the coming years; in this context, rising yields themselves make the market even more sensitive.

What does this mean for the market?

As Japanese government bond yields continue to climb, the impact will spread in three directions.

First, the yen carry trade will become more difficult. As JGB yields rise, the logic for overseas capital allocation into Japanese bonds will change, and the yen may be revalued due to policy spreads and its safe-haven status.

Second, the Japanese stock market—especially high-valuation growth stocks and high-dividend defensive stocks—will face pressure from rising valuation discount rates.

Third, the asset allocations of large Japanese life insurers, banks, and pension funds will be forced to adjust. As price volatility in ultra-long-term bonds intensifies, it will become harder for institutions to control duration risk in their portfolios.

More importantly, this will spill over into global bond markets. According to Reuters, global bond yields are rising overall due to "war-driven inflation concerns," with significant volatility appearing in the U.S. and Europe. Japan is not an outlier; it is simply one of the most sensitive nodes in this round of global repricing.

Looking Ahead

The key point to watch going forward is not whether yields will tick slightly higher, but whether the Bank of Japan will more clearly signal another rate hike at its meeting on April 27-28.

Currently, the market is truly concerned about two things: whether oil prices will continue to push inflation higher, and whether the BOJ will accelerate tightening for fear of falling behind the inflation curve. As long as these two questions remain unanswered, the JGB market will find it difficult to truly settle down.